Internal-combustion engine



M. PlTZM-AN INTERNAL coMBsTIoN ENGINE Filed Nov. 12 'fgi Figfl.

ATTORNEY Patented Apr. 1, 1924.

UNITED STATES 1,488,937; PATENT OFFICE.'

MARSHPITZMAN, F ST. LOUIS, MISSOURI.

INTERNAL-COMBUSTION' ENGINE.

Application filed November -12, 1921. Serial No. 514,523.

same, reference being had to the accompanying drawings, formlng part of this specification.

' My invention relates to means for improving the operation of internal combus tionengines and the particular embodiment herein.. described is designed for application te engines of the ordinary water cooled type used for krlriving vehicles.

In such engines, the Water from .the radiator is usually supplied to the engine water jacket at a point ad'acent to the front cylinder and in the case o single block engines may circulate from this point past all of the cylinders. Since the water :is at lower temperatures when passingthe front cylinder than when passing other cylinders its cooling eect is uneven andeif su ient for the rear cylinders may be` too great under average conditions for the front cyh inder.

Another difference in cooling exist in that the air currents Apassing the engl e Iii due to the movement ofthe vehicle and the" operation of the fan lare more effective on the front and rear cylinders than on intermediate ones. Uneven cooling of cylinders results in numerous disadvantages such as uneven distributionand quantities of fuel charges and ineiiicient combustion accompanied by .fouling of spark plugs in cylinders which are maintained at too low a temperature. Also in multiple cylinder engines in which the c linders are linearly arranged one side of oth the front and rear cylinders is adjacent to other cylinders, a condition which results' in a tendency to maintenance of a higher temperatureA in these portions than on the opposite sides which are exposed. This causes some cylinder distortion in operation and consequent impairment of compression.

' It is the object of my invention to proyidemeans for overcoming the hereina ove described unsatisfactory temperature conditions and produce a more even operating temperature throughout all cylinders and throu hout the walls of the front and rear cylin ers.

In the accompanying drawings, Figure l is a side view of one type of engine showlng my invention applied thereto; Figure 2 1s a top plan view-of the engine shown .in Figure l; Figure 3 1s a fragmentary view showing partly in section a cylinder wall and adjacent water passage and applied insulating means in accordance with my invention; Figure 4 is an enlarged sectional view of the insulator and retalning means applied tothe front of the engine as shown in the other gures.

1 represents a water cooled engine of the single block type and 2 a water passage adjacent to a part of one cylinder. 3 is a Water conduit by which Water is returned from the engine water jacket to the radiator (not shown). 4 indicates ,the fan for drawing in air through the radiator and propelling it past the engine.

In the embodiment of my invention illustrated, I achieve the objects hereinabove Set forth by applying to the front of the engine and to the rear thereof, sheets of insulating material 5, such as asbestos for example, and these sheets may be held in position and protected by sheets of brass 6 which in turn may be connected by wires 7 se ving to clamp the insulating sheets aga'nst the engine walls and hold them in position. j

`\'Sl`he sheets 6 are made to embrace onl a A uicient ortion of their adjacent cy 'inders\(usugwabout one half or the front cylinden) to ca e the cylinder temperatures to be...m"ainpine at the desired point, a result' which hey produce both by eliminating the eiect oi' external air currents and restricting the radiation of heat from the portions of the engine' walls` with which they are in contact.

The air currents uider the\engine hood vproduced by the fan andthe mepion of the -jyehicle are, of course, less\efi'ect1ve on. the

rear cylinder than on the `iront cylinder adjacent the -fan but are more effective eny the 'rear cylinder than on intermediate c' lindersA due to the eddy currents set up an the greater area exposed. It will usually be -neoi essa-ry to insulate a smaller area of the surface of the rear cylinder than of the front cylinder and dueto less effective cooling by the water and toother factors, insulation of the rear cylinder may in some instances be unnecessary.

By means described, ll am able to very eatly improve the operation of most if not all of the common type of automobile engines and accomplish this result by inex pensive means which are easily applicable.

My invention has the further advantage that the degree of insulation can be varied for each engine to compensate for eristing temperature producing and dissipating factors which are of Variable degree and effeet in different engines and under Varying conditions.

Having fully described my Ainvention what I claim as new and desire to secure by Letters Patent of the United States is:

l. rl `he combination with an internal combustion engine, of means adapted to restrict the radiation of heat from a selected portion only oi he lateral Walls of the engine cylinders to equalize the operating temperatures of the said cylinders.

2. The combination with a multiplecylinder internal combustion. engine, of heat insu lating means applied to a selected portion only of the lateral wall surface of the engine cylinders to restrict the radiation of engine developed heat therefrom, the remaining lateral cylinder Wall surface of the engine being uninsuiated.

3. The combination with an internal combastion engine, of a fan producing air curi Asses? rents directed thereupon', and means for restricting the cooling effect of the fan currents on a port-ion of the lateral cylinder Wall surface of the engine to a greater degree than on other portions of' said surface.

il. 'l he combination with a `multiple cylinder internal combustion engine, of a tan producing air currents directed thereupon, heat insulating means applied to the portion ci the engine cylinder wall surface nearest the ankthe lateral wall surface of intermediate cylinders being uninsulated from fan currents.

' 5. The combination with a multiple cylinder internal combustion engine, of heat insula'ting means applied to the lateral wall surfaces of the front and rear cylinders only to restrict the radiation of engine developed heat therefrom, the intermediate cylinders being uninsulated.

G. The combination with a multiple cylinder internal combustion engine, of means iiorming passages adjacent to the engine cylinder tor the circulation of cooling 1ne dium, and lieat insulating means applied to a selected'portion only of the exterior of the lateral cylinder Wall surface of said engine to increase the operating temperature oi a selected cylinder or cylinders less than all.

ln testimony Whereof, l have hereunto set my hand and affixed my seal.

Manen rirziuan. e.. s.) 

